Articolo in rivista, 2024, ENG, 10.1111/jace.19573

Influence of annealing on microstructures and properties of Yb:Lu2O3 transparent ceramics

Ziyu Liu, Yagang Feng, Guido Toci, Angela Pirri, Barbara Patrizi, Matteo Vannini, Jiang Li

School of Materials Science and Engineering, Changsha University of Science & Technology, Changsha, China Transparent Ceramics Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China School of Materials Science and Engineering, Henan University of Technology, Henan, China Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche, Sesto Fiorentino (Fi), Italy Istituto di Fisica Applicata "N. Carrara", Consiglio Nazionale delle Ricerche, Sesto Fiorentino (Fi), Italy

In this work, 5at.% Yb:Lu2O3 transparent ceramics were air-annealed at different temperatures to eliminate oxygen vacancies for laser performance improvement. The influence of annealing temperature on microstructures, optical quality, and laser performance was investigated comprehensively. The ceramics HIP (Hot isostatic pressing) post-treated at 1750°C and annealed above 1100°C show a significant optical quality decrease due to residual pore expansion, and the ceramic sample annealed at 900°C shows better laser performance than others. The maximum output of 2.88 W was obtained at 1033.3 nm with a slope efficiency of 37.4% under a quasi-continuous wave (QCW) mode. Note that 5at.% Yb:Lu2O3 transparent ceramics HIP post-treated at 1550°C still keep good transparency even when being annealed at 1300°C due to less residual compressed pores. The highest slope efficiency is about 73.8% with a maximum output power of 2.84 W under QCW. Fine-grained and dense Yb:Lu2O3 transparent ceramics could be annealed at higher temperatures to eliminate oxygen vacancies more thoroughly to improve laser performance.

Journal of the American Ceramic Society (Online) 107 , pp. 1974–1984

Keywords

annealing temperature, laser performance, microstructures, transparent ceramics, Yb:Lu2O3

CNR authors

Vannini Matteo, Toci Guido, Pirri Angela, Patrizi Barbara

CNR institutes